diff --git a/OpenSim/Region/ClientStack/Linden/Caps/BunchOfCaps/MeshCost.cs b/OpenSim/Region/ClientStack/Linden/Caps/BunchOfCaps/MeshCost.cs
index 8844a0fc06..adc8298867 100644
--- a/OpenSim/Region/ClientStack/Linden/Caps/BunchOfCaps/MeshCost.cs
+++ b/OpenSim/Region/ClientStack/Linden/Caps/BunchOfCaps/MeshCost.cs
@@ -40,7 +40,7 @@ using OpenSim.Region.Framework;
 using OpenSim.Region.Framework.Scenes;
 using OpenSim.Framework.Capabilities;
 
-using ComponentAce.Compression.Libs.zlib;
+using System.IO.Compression;
 
 using OSDArray = OpenMetaverse.StructuredData.OSDArray;
 using OSDMap = OpenMetaverse.StructuredData.OSDMap;
@@ -571,15 +571,15 @@ namespace OpenSim.Region.ClientStack.Linden
                 {
                     using (MemoryStream outMs = new MemoryStream())
                     {
-                        using (ZOutputStream zOut = new ZOutputStream(outMs))
+                        using (DeflateStream decompressionStream = new DeflateStream(inMs, CompressionMode.Decompress))
                         {
-                            byte[] readBuffer = new byte[4096];
+                            byte[] readBuffer = new byte[2048];
+                            inMs.Read(readBuffer, 0, 2); // skip first 2 bytes in header
                             int readLen = 0;
-                            while ((readLen = inMs.Read(readBuffer, 0, readBuffer.Length)) > 0)
-                            {
-                                zOut.Write(readBuffer, 0, readLen);
-                            }
-                            zOut.Flush();
+
+                            while ((readLen = decompressionStream.Read(readBuffer, 0, readBuffer.Length)) > 0)
+                                outMs.Write(readBuffer, 0, readLen);
+
                             outMs.Seek(0, SeekOrigin.Begin);
 
                             byte[] decompressedBuf = outMs.GetBuffer();
@@ -638,15 +638,15 @@ namespace OpenSim.Region.ClientStack.Linden
                 {
                     using (MemoryStream outMs = new MemoryStream())
                     {
-                        using (ZOutputStream zOut = new ZOutputStream(outMs))
+                        using (DeflateStream decompressionStream = new DeflateStream(inMs, CompressionMode.Decompress))
                         {
-                            byte[] readBuffer = new byte[4096];
+                            byte[] readBuffer = new byte[2048];
+                            inMs.Read(readBuffer, 0, 2); // skip first 2 bytes in header
                             int readLen = 0;
-                            while ((readLen = inMs.Read(readBuffer, 0, readBuffer.Length)) > 0)
-                            {
-                                zOut.Write(readBuffer, 0, readLen);
-                            }
-                            zOut.Flush();
+
+                            while ((readLen = decompressionStream.Read(readBuffer, 0, readBuffer.Length)) > 0)
+                                outMs.Write(readBuffer, 0, readLen);
+
                             outMs.Seek(0, SeekOrigin.Begin);
 
                             byte[] decompressedBuf = outMs.GetBuffer();